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arXiv 0901.3520cond-mat.mes-hallcond-mat.other
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纳米器件间声子介导的非平衡相互作用

Phonon-mediated non-equilibrium interaction between nanoscale devices

G. J. Schinner, H. P. Tranitz, W. Wegscheider, J. P. Kotthaus, S. Ludwig

摘要:

用声子谱方法研究了二维电子系统(2DES)中界面声子在平面内传播引起的介观器件间的相互作用。在我们的实验中,从偏置量子点接触注入的弹道电子发射声子,其中一部分被附近简并2DES中的激发电子重吸收。我们执行这些激发的电子采用可调的静电势垒在电分离和无偏检测器电路的能量谱。转移的能量被发现是有界的最大值对应于费米能级电子激发和背散射吸收界面声子。我们的结果表明,声子介导的相互作用对固态量子线路的退相干起着重要的作用。

英文摘要:

Interactions between mesoscopic devices induced by interface acoustic phonons propagating in the plane of a two-dimensional electron system (2DES) are investigated by phonon-spectroscopy. In our experiments ballistic electrons injected from a biased quantum point contact emit phonons and a portion of them are reabsorbed exciting electrons in a nearby degenerate 2DES. We perform energy spectroscopy on these excited electrons employing a tunable electrostatic barrier in an electrically separate and unbiased detector circuit. The transferred energy is found to be bounded by a maximum value corresponding to Fermi-level electrons excited and back-scattered by absorbing interface phonons. Our results imply that phonon-mediated interaction plays an important role for the decoherence of solid-state-based quantum circuits.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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